User:Elleke Hageman/Python: Sound and Image

Sound #1

import wave, struct

filename = "sound.wav" nframes=0 nchannels=1 sampwidth=1 # in bytes so 2=16bit, 1=8bit framerate=44100 bufsize=2048

w = wave.open(filename, 'w') w.setparams((nchannels, sampwidth, framerate, nframes, 'NONE', 'not compressed'))

max_amplitude = float(int((2 ** (sampwidth * 8)) / 2) - 1)

1. split the samples into chunks (to reduce memory consumption and improve performance)
2. for chunk in grouper(bufsize, samples):
3. frames = .join(.join(struct.pack('h', int(max_amplitude * sample)) for sample in channels) for channels in chunk if channels is not None)
4. w.writeframesraw(frames)

freq = 15000

1. this means that FREQ times a second, we need to complete a cycle
2. there are FRAMERATE samples per second
3. so FRAMERATE / FREQ = CYCLE LENGTH

cycle = framerate / freq

data = for i in range(10):

   for x in range(20000):
       data += struct.pack('h', int(0.4 * max_amplitude))
   for x in range(1000):
       data += struct.pack('h', int(-0.8 * max_amplitude))

w.writeframesraw(data)

w.close()

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